public class EX8_4 {
	public static void main(String args[]) {
		double sum = 0,item=0;
		boolean computable = true;
		for(String s:args) {
			try{
				item=Double.parseDouble(s);
				sum=sum+item;
			}
			catch(NumberFormatException e) {
				System.out.println("您输入了非法字字符:"+e);
				computable=false;
			}
		}
		if(computable)
			System.out.println("sum="+sum);
	}
}
